You can assign objects to the item of a quality notification.

In SAP S/4HANA QM, the item of a quality notification (transaction QM01) can reference specific objects:

Material (A): Materials are a standard object category, linking the notification to a specific material number (e.g., in the "Reference Object" section).

Batch (C): Batches (LO-BM) can be assigned to track batch-specific issues, a common QM feature.

Serial Number (E): Serial numbers (e.g., for equipment or materials) are supported to pinpoint individual units, especially in industries like electronics.

Delivery Item (B): Delivery items are referenced in SD notifications but not directly assigned as objects in the item structure in standard QM.

Purchase Order Item (D): POs are reference documents, not directly assignable objects in the notification item.

Thus, "Material," "Batch," and "Serial number" are the correct answers.References: SAP Help Portal - "Reference Objects in Quality Notifications"; SAP S/4HANA QM User Guide - "Notification Items".